Which of the following terms describes the functionality of "clicking a keyword link"?

The functionality of "clicking a keyword link" is best described by the act of adding the term to the search query. When a user clicks on a keyword link, it typically indicates the intent to refine or expand their search by including that specific term, effectively allowing them to focus on documents or results that contain that keyword. This action enhances the search by integrating the clicked keyword into the existing query terms, which can yield more targeted results.

The process of filtering results based on selected criteria generally involves options or facets that allow users to narrow down results based on predefined attributes, which is different from clicking a keyword link. Similarly, while removing non-relevant documents occurs as a result of narrowing search results, it does not directly relate to the function of clicking on a keyword link. Displaying a defined document pertains to directly opening or viewing a specific document, which is not the action represented by clicking a keyword link.